Recommendation for activity tracker for kids

Anyone used the Garmin Vivofit Jr or Fitbat Ace devices?

My 7 y/o has asked Santa for a watch that does everything like my Dad’s watch. I bought my other half a Garmin 35 which is great, but I think it might look a bit chunky.

My daughter has a Garmin junior. She likes it for steps/activity minutes/ the Frozen 2 game.

Not useful if you want to track runs or sports more like we triafleets do.